Replaced GL_QUADS usage with GL_TRIANGLES to aid portability.
Replaced GL_QUADS usage with GL_TRIANGLES to aid portability.

jtorresfabra/osg,jtorresfabra/osg,openscenegraph/osg,openscenegraph/osg,openscenegraph/osg,jtorresfabra/osg,scrawl/osg,jtorresfabra/osg,scrawl/osg,scrawl/osg,openscenegraph/osg,scrawl/osg